Random: wrap crypt_random_string in a function_exists call

phpseclib/Crypt/Random.php

@@ -40,6 +40,10 @@
  * @link      http://phpseclib.sourceforge.net
  */
 
+// laravel is a PHP framework that utilizes phpseclib. laravel workbenches may, independently,
+// have phpseclib as a requirement as well. if you're developing such a program you may encounter
+// a "Cannot redeclare crypt_random_string()" error.
+if (!function_exists('crypt_random_string')) {
     /**
      * "Is Windows" test
      *
@@ -244,3 +248,4 @@ function crypt_random_string($length)
         }
         return substr($result, 0, $length);
     }
+}